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♻️ better explanation for Cat

This commit is contained in:
Quentin DESBIN 2024-04-12 10:36:39 +02:00 committed by zanninso
parent d4e350331f
commit f6eee7accf
1 changed files with 15 additions and 9 deletions
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24
subjects/java/piscine/Cat/README.md
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@ -4,7 +4,7 @@
Create a file named `Cat.java`.
Write a function `cat` that reads from the file given as the argument, and writes to the standard output.
Write a function `cat` that reads the content of the file given as the argument, and writes it's content to the standard output.
> ⚠️ The files can have some binary content.
@ -33,22 +33,27 @@ import java.io.*;
public class ExerciseRunner {
public static void main(String[] args) throws IOException {
PrintStream stdout = System.out;
ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
PrintStream printStream = new PrintStream(outputStream);
System.setOut(printStream);
Cat.cat(new String[]{"input"});
Cat.cat(new String[]{"input.txt"});
String output = outputStream.toString();
System.out.println(outputStream.toString().equals("test input file\n"));
// Reset out to stdout
System.setOut(stdout);
System.out.println(output.equals("test input file\n"));
ByteArrayOutputStream outputStream2 = new ByteArrayOutputStream();
PrintStream printStream2 = new PrintStream(outputStream);
PrintStream printStream2 = new PrintStream(outputStream2);
System.setOut(printStream2);
Cat.cat(new String[]{});
String output = outputStream2.toString();
System.out.println(outputStream2.toString().equals(""));
String output2 = outputStream2.toString();
// Reset out to stdout
System.setOut(stdout);
System.out.println(output2.equals(""));
}
}
```
@ -66,5 +71,6 @@ $
### Notions
[Command-Line Arguments](https://docs.oracle.com/javase/tutorial/essential/environment/cmdLineArgs.html)
[File](https://docs.oracle.com/javase/7/docs/api/java/nio/file/Files.html)
[Standard Output](https://docs.oracle.com/javase/7/docs/api/java/io/PrintStream.html)
[File](https://docs.oracle.com/en/java/javase/21/docs/api/java.base/java/nio/file/Files.html)
[Standard Output](https://docs.oracle.com/en/java/javase/21/docs/api/java.base/java/io/PrintStream.html)
[IOException](https://docs.oracle.com/en/java/javase/21/docs/api/java.base/java/io/IOException.html)